In a one-shot I ran of my Underdark 'bartertown', the [dark]elf fighter Saraseth had as her signature weapon as a 'butterfly' axe that was huge and had hooks and spikes. It was forceful, messy and dealt significant damage. She named it Venom.
We used the custom move that allowed carry-through damage for 'big' hits. One one particularly successful 10 up Hack and Slash that dealt extra damage against a clutch of vicious orb spiders, she managed to evercserate one spider and have a handful of left-over damage to pass on to the next arachnid. I asked Yarmani (the player) how her forceful, messy weapon would deal such horrific damage.
She described the crumpled form of the spider being flung into the sorrounding stalagmites, ichor spraying across the cavern and splattering everyone nearby as the follow through sweep embedded deeply in the remaining spider. This segued into the cleric loosing hold of his holy symbol on a missed prayer move, as it was covered in the re-incorporated spider guts from previously. This also allowed for my impending dooms to escalate as the doppleganger tracked them solely on the base of smell, since no-one seemed interested in a bath to wash off the gore.